The human body is complex, so it is not unexpected that there are numerous levels of structural organisation for the benefit of description, the human body can be thought about to be functionally arranged into different systems The levels of organization from easiest to many complex are chemical, cellular, tissue, organ, organ system, and organismal (the body as a whole).

Chemical Level

The chemical level includes atoms, molecules, and macromolecules. At the easiest level, the body is made up of chemical substances that are formed of atoms and molecules Atoms are the basic foundation of chemicals, and atoms integrate in particular methods to form molecules Some particles are remarkably little, such as water molecules, however, others might be large, such as the macromolecules of proteins Numerous small and big molecules are organized together to form organelles. An organelle is a microscopic subunit of a cell, rather like a small organ, that performs particular functions within a cell. Nuclei, mitochondria, and ribosomes are examples.

Cellular Level

Cells are the standard structural and practical systems of the body because all the processes of life happen within cells A cell is the most affordable level of organisation that lives. The human body is made up of trillions of cells, and several types of cells, such as muscle cells, blood cells, and nerve cells Each type of cell has a special structure that allows it to carry out particular functions.

Tissue Level

Comparable types of cells are typically organised together in the body to form a tissue Each body tissue includes an aggregation of similar cells that carry out comparable functions There are 4 important classes of tissues in the body: epithelial, connective, muscle, and nervous tissues.

Organ Level

Each organ of the body is made up of 2 or more tissues that interact, allowing the organ to perform its particular functions The body includes many organs, and each has a certain form and function. The stomach, heart, brain, as well as bones are examples of organs.

Organ System Level

The organs of the body are set up in practical groups so that their independent functions are collaborated to carry out particular system functions These collaborated, practical groups are called organ systems The digestive and nervous systems are examples of organ systems Many organs come from a single organ system. However, a couple of organs are appointed to more than one organ system For instance, the pancreas comes from both the digestive and endocrine systems.

Systems Significant Functions
Integumentary system Secures versus environmental risks; assists manage body temperature
Skeletal system Supplies assistance; secures tissues; shops minerals; types blood cells
Muscular system Produces movement; supplies assistance; creates heat
Nervous system Directs instant responses to stimuli, typically by collaborating the activities of other organ systems
Endocrine system Directs long- term modifications in other organ systems
Cardiovascular system Transportations cells and liquified products, consisting of gases, nutrients, and wastes
Lymphatic system Resists infection and disease; returns tissue fluid to the blood stream
Respiratory system Provides air to sites where gas exchange takes place in between the air and flowing blood; produces sound
Digestive system Processes food and soaks up nutrients
Urinary system Removes excess water, salts, and wastes; controls pH
Reproductive system Produces sex cells and hormones; supports embryonic development from fertilisation to birth (female)

Integumentary System

Secures versus environmental risks; assists manage body temperature

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